Formal student thinking in mathematical problem-solving

The purpose of this research is to find out the students' thinking process in formal cognitive development in solving mathematical problems. The problem solving used in this study uses patterns from the pattern that have been adapting to the habits of students in Indonesia, namely the first stage is known, the second stage is asking, and the third stage is answering. This study was included in a qualitative descriptive study using six junior high school students with formal that were used as research subjects. The research instrument used in this study is Test of Logical Operations and mathematical problem-solving tests. Data analysis techniques are used using Milles, Huberman, and Sandana. From the results and discussion of the research carried out, it can be concluded that students with formal cognitive in the first and second stages tend to think about assimilation and abstraction. While in the third stage, students in formal tend to think about assimilation processes even though there are subjects who do the accommodation thinking process.